为什么是知更鸟？为什么不是鸽子、杜鹃或麻雀？讲到鸟，我第一个想到的例子就是它们。
wèishénme shì zhīgèngniǎo ？wèishénme bùshì gēzi 、Dùjuān huò máquè ？jiǎngdào niǎo ，wǒ dì yī ge xiǎngdào de lìzi jiùshì tāmen 。
Why is it the robin? Why isn't it the pigeon, the cuckoo or the sparrow? When you mention birds, those are the first examples I think of.